NSRRC Activity Report 2022

030 NSRRC ACTIVITY REPORT 2022 In addition, depth-profiling X-ray photoelectron spectroscopy (XPS) analysis at the TLS 24A1 beamline was employed to prove whether water exists in the channels. By changing the photon energy of the incident X-ray, this XPS method can probe the chemical compositions of the surface at different depths ( Fig. 2(e) ). The C 1s and O 1s spectra can be decomposed into a C−C bond and a C=C bond, corresponding to the hydrophobic shell and a series of peaks from C−C−O, C−C=O, O−C=O, and O−C=C segments, which are attributed to the hydrophilic core. Furthermore, in the O 1s spectrum, the O−H signal of water is directly observed. The relative intensity areas corresponding to the hydrophilic cores and water increase with the increase in the depth, while the intensity areas corresponding to the hydrophobic shell decrease. This finding demonstrated that the hydrophilic core of the column can incorporate water molecules; hence, it may be used as artificial water channels to transport water molecules. The artificial water channel array of AD exhibits a salt rejection ratio of > 99.9% and a water permeability of 7.7 × 10 6 H 2 O·channel −1 ·s −1 , which is comparable to those of commercial thin-film composite membranes. (Reported by Wei-Tsung Chuang) This report features the work of Chien-Lung Wang, Kuan-Yi Wu and Wei-Tusng Chuang and their collaborators published in J. Am. Chem. Soc. 144 , 7768 (2022). TPS 25A Coherent X-ray Scattering TLS 24A1 XPS, UPS, XAS, APXPS • SAXS, WAXS, GIXRD, In-situ SAXS • Supramolecular Chemistry, Artificial Water Channels, Amphiphilic Liquid Crystals Reference 1. Y. Chen, H. Y. Chang, M. T. Lee, Z. R. Yang, C. H. Wang, K. Y. Wu, W. T. Chuang, C. L. Wang, J. Am. Chem. Soc. 144 , 7768 (2022). Stabilization of Lead-Reduced Metal Halide Perovskite Nanocrystals Through High-Entropy Alloying A novel perovskite alloy doped with various metals is developed for environmentally friendly materials. W ith the emergence of ambient intelligence in the 21 st century, mobile devices and home automation have become ubiquitous. Technological innovations have enabled display technology to evolve beyond providing only display functions. Currently, humans can directly issue instructions to display systems through logic semiconductor technology, overcoming the binary nature of computers. Displays no longer provide only display functions. In addition, the production of commercial inorganic fluorescent materials requires an evaporation process that consumes considerable energy and exhibits a rigid structure. Colloidal metal halide perovskite (MHP) materials exhibit excellent optic properties and solution processability, Scheme : The stacking-controlled colloidal synthesis of two-dimensional perovskites was achieved through a collaboration between the research team of Shih and Chiu. [Reproduced from Ref. 1]